Dredger.



PATENTED MAY 2, 1905.

C. DELLMANN.

DREDGER.

APPLIOATION FILED s132128, 1904.

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ffafw eg.

PATENTED MAY 2, 1905.

C.l DELLMANN.

DREDGER.

APPLIUATION FILED ssn. 2a. 1904.

2 SHEETS-SHEBT 2.

Y/a ewes v TTnD STATES Patented May 2, 1905.

PATENT OFFICE.

CARL DELLMANN, OF DSSELDORF, GERMANY, ASSIGNOR TO THE FIRM OFDSSELDORFER KRAHNBAUGESELLSOHAFT LlEBE-HARKORT Gr.

B. H., OF DSSELDORF, GERMANY.

DREDGER.

SPECIFICATION forming part of Letters Patent No. 788,891, dated May 2,1905.

Application led September Z8, 1904. Serial No. 226,368.

To 1J/Z whom 7115 71u07/ concern:

Be it known that I, CARL DELLMANN, en-

gineer, a subject ot' the King of Prussia, German Emperor, and aresident of Schtzen- 5 strasse, Dsseldorf, in the Province of the Rhine,German Empire, have invented certain new and useful Improvements inDredgers, of which the following is an exact speciiication.

O My invention relates to a turning-scoop dredger or self-gripper, andmore especially to a new construction oi' the block and tackle foropening and closing the scoops. In the constructions hitherto used thisblock and 5 tackle consists in most cases oi' two halves symmetricallyarranged to the scoop middle, the chain parts ot' which are connected tothe chain for opening and closing by means of a ClOSS-Fl` When thisnrnQQ-iir'nfr wurm nnrm O the chain-roller, shocks arise, which,however, will be avoided by my present invention. For this purpose Iemploy a block and tackle with one chain only.

My invention consists therein that the block-and-tackle rollers being inthe middle plane vertically to the direction of the scoop movement areso arranged that the first and the second vertical chain part aresituated at both ends of the traverse for closing the scoops,

O and it further chain parts are present the same are arranged right andleft hand to the gripper middle.

In order to make my invention more clear, I refer to the accompanyingdrawings, in

5 which- Figure 1 is a front view of a convenient form of my invention.Fig. 2 is a side View olE the same.

In the drawings, Z represents scoops turning D around the trunnions orpivots q.

a is the scoop-frame.

71 is a traverse moving up and down within the scoop-frame. The scoops Zare connected to the traverse b by means of joint-rods c.

g /z/ ml are rollers mounted upon the scoopframe, whereas z' 7n a arerollers mounted upon the traverse j is a chain which is guided in such amanner around the rollers mentioned that the iirst and the secondvertical chain part e are situated at both ends of the scoop. The thirdand fourth chain parts, however, are arranged on the right and left sideto the gripper middle, as shown in the drawings.

In arrangements in which further chain parts should be arranged thesaine would be guided in a corresponding manner. The end of the chain fis fastened to the scoop-frame c at o.

The closing ot the scoops is eected by rack- 6o ing the chain f. Therebythe traverse is moved upward within the frame a, so that the scoop endsapproach each other. For opening` the scoops a chain s is provided,which is held fast for this purpose, and then the chain f is loosened,so that the scoop ends remove from nlm lav w 111' "un nd-ls presentconstruction of block and tackle two successive chain parts are arrangedat different sides to the scoop middle, it can be ob- 7o tained that theresultant of all the chain-traction forces is in the middle of thegripper, so that the traverse cannot get oblique, whereby a good workingof the arrangement is obtained, so that the apparatus cannot get out oforder.

Having thus i'ully described the nature of my invention, what I desireto secure by Letters Patent of the United States is- 1. In aturning-scoop dredger, the combination of a frame, scoops pivotallymounted in this frame, with a traverse for closing the scoops, means forconnecting' the traverse to the scoops, a set of rollers mounted on theframe, a second set of rollers mounted on the traverse, a chain ledaround the rollers and secured with one end to the frame, the rollersbeing so arranged in the middle plane vertical to the direction of theturning movement ot' the scoops, that the lirst and the second 90vertical chain part are at both ends oi' the traverse, substantially asdescribed and for the purpose set forth.

2. In a turning-scoop dredger, the combination of a frame, scoopspivotally mounted on the frame, with a traverse for closing the A n 3.,.W."

IO chain part are at both ends of the traverse` and the other chainparts are so arranged that the resultant of all the chain-tractionforces is in the middle of the dredger, substantially as described andfor the purpose set forth.

In Witness Whereoil I have hereunto set my I5 hand in the presence oftwo Witnesses.

CARL DELLMANN. itnessesz PETER LIEBER, WILLIAM ESSENWEIN.

